Control apparatus



Dec.16,1941'. .A WPLENSLER 2,266,709

CONTROL APPARATUS Filed July 29, 1940 2 Sheets-Sheet l Dec. 16, 1941. A. w. PLENSLER 2,266,709

CONTROL APPARATUS Filed July 29, 1940 2 sheets-shea 2 L y m f 2.x...

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f@ fr? @Zara Patented Dec. 16, 1941 l CONTROL APPARATUS Alexander W. Plensler', Chicago, Ill., assignor to Belmont Radio Corporation, Chicago, Ill., a corporation of Illinois Application July 29, 1940, serial No. 348,161

This invention relates in general to control apparatus and more in particular to a control ,device for a. tuning system for radio receiving apparatus.

Because of the necessity in radio control apparatus of the so-called automatic tuning type, for converting a short linear or pivotal'movement of a push button or selectorunit into rotary or linear movement of a different angular or quencies, means are provided for` making a relative adjustment or setting between the rotary means and the push button or selector units in some manner so that each unit maytune more than one` station frequency, depending upon the particular setting. Of course, only one frequency can be tuned in for each setting, but various settings are obtained from the proper adjustments. This adjustment or setting has been accomplished by adjustable elements on 'the rotary means, or an adjustable element in each push button or selector unit. vention is directed to the latter type. In the devices prior to the present invention, various means have been employed toy frictionally lock the adjustable element on the push button or selector unit, but all of these means normally require the use of both hands of the operator while performing the setting operation which is clumsy and sometimes rather difllcult, and this often results in a change of `position of the adjustable element before it is locked in set position. Many of the prior devices require supplementary tools such as a screw driver or the like, for changing the friction pressure on the adjustable element. With the latter type of mechanism, there is the problem of retaining the necessary tools so that they are always available, and at best,`it is sometimes a complicated situation.

In addition to the clumsy complicated methods which have been necessary in the prior art devices having the adjustable means in the selector units, as referred to above, these devices have introduced a further problem of space in that the various constructions previously employed required substantial lateral space for the control mechanism because' of the lateral ydimensions of cach selector unit. Space is an important factor in the majority of radio receivers manufactured to date, and all savings in space are extremely The present in-4 important to the manufacturer. from a cost standpoint, and in addition often times enable such manufacturer to improve and simplify designs so as to give .them a greater eye appeal.

An object of this invention is to provide an improved control device for control apparatus, particularly tunable radio apparatus.

Another object of this invention is to provide adjustable control apparatus in which the adjustment is accomplished,` in selector units for the apparatus, andsuch adjustment is carried out quickly and easily with the use merely ofV one hand of the operator, and without the use of supplementary tools.

A further object of the invention is to provide adjusting means and frictional locking means for the adjusting means in the control apparatus, all of relatively small dimensions laterally thereof, so as to take up a minimum amount of space over the complete control apparatus if a saving in space becomes desirable.

A still further object ls to provide frictional locking means for adjustable means in a-control' apparatus which isv readily operated, and will positively lock the adjustable means in an adjusted position, and maintain this position on repeated operation of the control apparatus.y

A feature of this invention is theprovision of control apparatus particularly adapted for tuning radio receiver apparatus which may b e setto tune various predetermined frequencies by a setting operation requiring merely a linear pull or push similar to the usual tuning operation.

Another feature of the invention yis the provision of adjustable radio tuning apparatus lhav. ing adjustable elements on the selector units therefor, and frictional locking means yfo'r the adjustable elements operated simply in a push or pull movement by a single hand of the operator.

Astill further feature ofthe invention is `the provision of selector units for radio tuning apparatus which carry adjustable means thereon to adapt the apparatus for tuning to a large number of predetermined stations, with the selector units being of relatively small dimensions laterally or transversely thereof so as to permit the condensing laterally of the complete ap paratus if itis desired. q

Further objects, features and 'advantages of .this invention will become apparent from the Fig. 2 is a sectional view as seen along the line 2-2 in Fig. l;

Fig. 3 is an enlarged sectional view taken along Fig. 6 is an enlarged sectional .view taken along the line 6-6 in Fig. 4;

Fig. 6A is illustrated similarly .to Fig. 6 and shows parts thereof. in a changed position;

Fig. 7 is a furthermodied form of the invention, and l Fig. 8 is a sectional view taken along the line 8-8 in Fig. 7.

The tuning device of the invention is illustrated in Fig. 1 with representative resonant frequency changing means which includes a tuning condenser IIJ having a iixed frame I I and a rotatable shaft I2, which is rotatable through 180 degrees to provide the full range of tuning. The condenser I is suitably connected to the radio receiving set (not shown) The shaft |2 is suitably connected to shaft I3 through coupling means I4 and the shaft I3 is provided with a gear segment I 8 which meshes with a pinion I1 mounted at one end of. a tuning shaft I8. Rotation of the shaft I8 by tuning knob I9 tunesA the condenser I0 to a given frequency in an obvious manner. It is understood that other types of frequency changing mechanismsmay be substituted for the condenser III.

lThefshaft I 3 also carries a treadle b ar 2| which is in one piece, of hollow construction, andl of substantially V-shaped section, the adjacent angle or engaging portions 2 3 and 23' being supported by an integral slotted portion 24. Rotation of the treadle'member 2|, is obtained by'actuation of the tuning knob I9 and also by actuation of the station selector or push button units 26 which are supported inthe frame walllportion 21 and bracket members 28 and29. Each'unit 28 in- Icludes an operating 'or-carriage member 3| and an actuatingor push rod member 32.

The carriagemember 3| is of flat form and is provided with a body portion 33 having an adjustable driving member or cam element 34 at one end, the oppositeend 39 of the body portion being slidably supported in the panel 21. Element. 34

is of substantially semi-circular shape and is pivotally supported on a pin 31 with its diametrically opposed flat engaging portions 38 and 38' facing normally in the direction vof the treadle bar 2|. An abutment or lip portion 39 is bumped out of A the body portionv 33 in a position in longitudinal supporting screws or bolts 42 and 43 and is lat- I erally spaced from the portion 33 by its engagement with the lip portion 39 and the element 34. The cross-arm of the friction member 4I is of arcuate contour in -correspondence'with the contour o f the element 34 to permit of a maximum bearing pressure between these parts, as will be explained. The member 4I is maintained in longitudinal alignment relative to the cam 34l by the 'screw 42.

A nut 44 is provided at oneend of the screw 43 and is suitably rigidly secured to the member 3| as by soldering or like means The opposite end of the screw is provided with a. pivoted lever 46 having a hub or bearing portion 41 engageable with the member 4I through an intervening friction washer F. Thus on angular movement of the lever 46 in a clockwise direction as viewed in Fig. 2, to thread the screw 43 within the nut 44, the hub portion 41 advances laterally of the operating member 3 I operatively engages the member 4|, and urges it against the cam 34. In other words, the lever moving laterally relative to the member 3| as the screw 43 moves axially in the nut 44, engages the friction washer F, pushes this, and in turn moves the member 4| against the adjustable element or cam 34 to clamp the cam against'the operating member. The lip portion 39 normally retains the member 4I in a plane Y substantially parallel to the plane of the adjustable element 34 but there is a slight pivotal movement of the member 4| for clamping. Thus'- movement of the lever 46 in a counterclockwise direction to unthread the screw 43 from the nut 44, the hub portion 41 is retracted from the member 4I which in turn releases the cam 34 from its clamped or frictionally engaged position. Since the member 4| is entirely and loosely supported on the screws 42 and 43, it is readily apparent that the cam 34 is thus freely angularly movable on the operating member 3|.

In Fig. 2 the two operating positions of the lever 46 are shown to effect a locking of the cam 34. the full lines indicating its position for locking the cam 34 and the dotted lines its unlocked position. The lever 46 is operated by the slidably supported and linearly movable actuating member 32. Member 32, as viewed in Fig. 2, is formed at the top thereof with a recess 43, the sides of which engage a handle or catch p'ortion 49 at the free end of the lever 49. On movement of the member 32 relative to the carriage member 3|, and the latter retained in a stopped position at one end or the other of its operating stroke, the lever 46 is moved to either of its two operating positions to frictionally lock, or cause release of the cam 34, as will be explained.

The normal operation of the selector unit 26 to rotate the treadle bar 2|, and hence the condenser unit In to a predetermined tuning position is best understood from Fig. 2, in which view the cam 34, and lever 46 are shown in locked position. As shown, the cam 34 and treadle bar 2| are inclined toward each other with the engaging portions 23' and 38 closer together than the engaging portions 23 and 38. Thus on actuation of the unit 26 by pushing inwardly, or to the left,

on the knob 5I on the actuating member 32, the carriage member 3| is moved toward the treadle bar' 2| concurrently with the member 32 by virtue of the locked position of the lever 48 and its engagement in the recess 43. 'I'he portions 23' and 38' are, therefore, first brought into engagement, the continued linear movement of the unit 26 acting to rotate the bar 2| clockwise until engagement is also made between the portions 23 and 38. This engagement of both pairs. of corresponding portions 23 and 38, and 23 and 38' represents the home or tuned position of the unit.' The unit 26 on release of the knob'l is returned to its idle position by the action of a coil spring 52 which is mounted on a finger portion 53 of lthe operating member 3|, the spring beingarranged in compression between .the bracket 29 and a shoulder portion 54 on the operating member 3|. In operating the control device, a selector unit is always pushed inwardly,

v ticular tuningl positionof the bar 2| as set by the or to the left, as viewed in Fig, 2, to the same v longitudinal position when the condenser is in a tuned position, with the treadle bar and cam being in flush engagement `at this tuned position. It is to be understood, however, that the angular position of the treadle and 'cam facesi'will vary in accordance with the particular frequency of ythe station being tuned by the selector unit.

The selector unit is shown in Fig. 2 in its idle or rest position, with the carriage 3| in abutting engagement at the `portion 56 with the panel 21. With the member 3| thus held against further movement toward the right, in order to release the frictional locking on the cam 34-to adjust it to a new position, the knob 5| on the actuator member 32 is pulled toward the right. Since the carriage member 3| is held by the panel 21 this pulling moves the. lever from its frictionally locked position' as indicated by the full lines to its released position as indicated by the dotted lines. The cam 34 is then free to pivot on the operating member3l. The treadle bar 2| is turned to a particular tuning position by operation of the tuning knob I9, the treadle being held in such position by the normal condenser load applied on the shaft |3. Normally'an appropriate tuning scale is provided to indicate the l position of the treadle bar.

With the member 32 and the lever 46 in their dotted line positions, as shown in Fig. 2, application of manual pressure on the knob 5| moves both the actuating member 32 and the carriage member 3| toward the treadle bar 2|, by virtue operation ofthe tuning knob I3. During this actuation of the unit 26 the tuning knob I3 remains untouched and the radio operator needl only use one hand in all of the manipulations of the selector unit 26 described, with the treadle bar and the associated condenser unit ||l supplying all of the necessary reaction to the adjusting forces to make the desired adjustments possible.

Upon release of the push rod or actuating member 32, the selector unit 26 with the parts thereof in their locked position, is returned to its .starting or idle position by the return spring 52,v

the lever .46 moving the actuating member 32. Lever 46 in its locked position is thus seen to connect the members 3| and 32 together for concurrent movement in both directions. Later actuation of the unit will thus rotate the bar 2| from any position which it might have to the position corresponding with the 'angular adjustment of the cam 34.

lng the lever in released position. With the lever 46 thus held in its dotted line position on linear.

movement of the members 3| and 32 toward the left, the cam 34 remains freely movable on the operating member 3|. ..On.engagement ofthe cam portion 33' with theba'r portion 23,there fore, the cam 34 is rotatedangularly in a counterclockwise direction. The'bar 2|', meanwhile,.re

mains immovable ,and in the tuning positionobtained by manipulation of vthe tuning knob as was just described. This rotation of' the cam is continued until the corresponding portions 23 and 33, on the bar and cam, respectively, are also brought into engagement. In this position,--

the carriage 3| is positively stopped against fur-fg ther movement toward the left due to the fact that the axis of the treadle bar and the longitudinal axis of the body portion 33 of the carriage A modified form of the invention is shown in Figs. 4, 5, and 6, which is similar in many respects to the embodiment of Figs. 1, 2 and 3. Similar numerals of reference, therefore, shall be used to designate similar parts. The cam 34 is normally frictionally engageable with a clamping member 4|' of substantially .rectangular shape which is supported on a pin 56 mounted in the body portion 33 of the carriage or operating member 3|.-

Longitudinal alignment of the member 4|' with respect to the cam axis or pin 31 is maintained by an ear 53 (Fig. 5) formed at one end of the member 4|' and` positioned in an aperture 6| formed in the member 3|. A pin or spacing member 62 arranged'near the ear 59 functions to keep the member 4|' spaced from the operating member 3| a distance which is substantially y l equal to the thickness of 'the cam 34, whereby to assure a flush engagement between the cam and the portion 63 of member 4I.

AThe clamping member 4| adjacent the portion 63 is provided with a pin 64, the projecting end 66 of which is tapered and engageable with the hub 41' of a lever 46 (Fig. 6). As shown in Figs. 4 and 6, the lever hub 41 at a peripheral portion thereof is formed with a recess 61 having a curved or upturned side 68 engageable with the tapered pin 64. The vlever 46 is rotatably mounted on the pin 58 and is axially movable thereon betweenthe face portion of the member 4|'- and the pin head 69. It is thus seen that when the projecting end 66 of the pin 64 is posi-` tioned within the hub recess 61, lthat the lever and clamping member 4|' are loosely supported on the pin 58 whichposition, as indicated by the A dotted lines in Fig. 4, provides for a free angular member 3| are-in the same horizontal plane.

With continued application of pressure on the knob 5|, therefore, the push rod-32 moves relative to the carriage 3|, and pivots the lever 46 into its locking or full-line position as shown in Fig. 2 whereby to frictionally lock the cam 34 between the member 4| and the carriage 3|. The arrangement of the hub portion t1 in close proximity to the cam 34 provides for al maximum bearing pressure between the member 4| and the cam 34 to assure a positive locking thereof. The push rod, carriage, and cam are thus locked in a relatively fixed position by the action of the lever 46 and member 4i, which position represents the'normal liperating position of the selector unit Qmvement of the cam 34 on the carriage member 3|.v As explained with reference to the structurel of Fig. 1, when moving the members 3| and. 32 to the left, with the lever 46' in an unlocked position, Vsufficient inertia is applied by spring and washer, to prevent the member 4| from lockingy the cam, until the latter is in the desired adjusted position. However, on movement of the lever k46' in a clockwise direction, the upturned lever portion 68 formed in the lever hub 41 at a recess 61 therein engages the bevelled end 66 of pin 64 (Fig. 6A) to urge the clamping member 4|' against the cam 34. thus clamped in a`locked position between the member 4|' and the operating member 3|. The

upturned portion 68 at the recess 61 facilitates.

the engagement of the lever hub portion 41' with The. cam is.

, member 12 the spring 18 initially pulls the pivoted operating member 13 or 'lever with it, as

Afis obvious from an examination of Fig. '1. On

angular movement of the lever between its two l operating positions is thus seen to be relatively small.

.The lever 46' is operated by the actuating member 32 which is engageable with .the levercatch portion 49 at the recess 48 in a-manner similar to that previously described in connection with Figs. 1 to 3. As indicated in full linesin Fig. 4. when the lever 46' is in its locking position the cam 34 is frictionally locked in an adjusted position between the clamping member 4|' and the operating member 3| I'hus on movement of the actuating member 32 toward the left as viewed in Fig. 4, the carriage 3| will also be .moved to the left by virtue of its operative connection therewith through the lever 46'. The cam 34 will, therefore, engage the treadle bar 2| to rotate the treadle bar in a clockwise direction in the-manner above described,l to the predetermined tuning position selected vfor the unit 26'. It is understood that the treadle bar may be. in such a position that it will be rotated in a counter-clockwise direction by the cam 34 when moving itto home position. On release of the knob the unit 28' is returned toits idle position by the coil spring 52'mounted onthe carriage finger 53. 'Ihis idle position of the unit 2li'l is determined by the engagement of the carriage portion 56 with the panel 21, so that adjustment of the cam 34 tol a predetermined angular position is obtained in a Amanner similar to that previously explained for the embodiment of Figs. 1 to 3. A further description of the operation of the selector unit of Figs. 4 to 6 is, therefore, believed to be unnecessary.

A'further modied form of the selector unit for operating a treadle bar 2|' is shown in Figs. '1 and 8. The selector unit 1| includes an actuating member 12 and an operating member or carriage 13, the member 12 being slidabl-y vsupported in the wall portion 21 and bracket member 14. Member 13 is pivotally connected at one end to a shaft 16 which is suitably mounted in the frame means 22. The end 11 of the operating member 13 is in operative .engagement with the actuating member 12 through a. spring connection 18. An adjustable element 19 of substantially semi-elliptical shape and having a transversely extending flange portion 8| is pivotally mounted on the operating member 13, and arranged so as to have theflat portion 82 formed thereon engageable with the corresponding front ,face on the rotary treadle member 2|. The adjustable member 19 is locked in an adjusted position by a locking or wedge member 83 which is pivotally connected at one end to the operating member 13 and -is formed at Aits opposite end with a projecting ear 84 which is engageable With longitudinally'v spaced yabutments 86 and 86A formed on the actuating member 12. The member 83 is formed along one side thereof -with a tapered portion 81 which is arranged for move.- ment between the adjustable element 19 and the operating member 13. Thus on movement of the actuator member 12 and hence the entire selector unit 1| to the left, as viewed' in Fig. 7, the tapered portion 81 is wedged between the element 19 and the operating member 13 to frictionally lock these members into a fixed relative position for a purpose to be explained. On this movement of the movement of the actuating member 12 to the right by pulling on the knob 5|', the ear 84 engages the projection 86 to release the member 83 from its wedged position, the -pin or abutments 88 holding the operating member 13 from moving with the actuating member beyond the position of the pin 88 during its movement toward the right.

In the Ioperation of the selector unit 1| the treadle' bar 2|' is turned to a predetermined control position by the tuning knob I9, it beingI assumed that the adjustable element 18 is in a released condition so as to be freely rotatable on the operating member 13. On movement of the actuating member 12 toward the left, asA viewed in Fig. 7, the operating member 13 isalso moved to the left concurrently with the actuating member through the spring connection 18. The

spring 18 is of suicient strength with a normalv The nal push onthe knob 5|' likewise pushes the member 83 over the nib into locking position. 0n flush engagement of the flat portion 83 and the face of the treadle bar, the carriage 13 will no longer be moved to the left by the actuating member 12, so that continued movement toward the left of the member 12 will engage the abutment 86 with the ear `84 to move the locking member 83 to its wedged position, whereby to frictionally lock the adjustable member 18 in its adjusted position. On the final movement the abutment 88 will act through the member 83 and the operating member. 13, to maintain the cam 18 in its final engagement with the treadle bar 2| in home or set position. The selector unit 1| is thus conditioned so that upon its later actuation it will operate to move the treadle bar 2|', regardless of its angular position, to the tuning condition preselected for the unit.

From the above description, therefore, it is evident that the present invention provides radio control -apparatus which can be readily adjusted to various predetermined positions for accomplishing tuning at those positions. In all three illustrated embodiments, an adjustable elementl is provided on each push button or selector unit so that each such unit may be set to a number of different tuning positions. The adjustable element is releasably locked in a set position by friction means including a member in a plane substantially parallel to or coplanar with the plane of the adjustable element. The frictional forces are applied in such a manner that the adjustable element'is positively locked in a set position for all subsequent tuning operations of the unit. Furthermore, the frictional pressure is applied and released from the adjustable element merely by pushing in or pulling out the tuning knob by-one hand thus greatly expediting and simplifying this operation.

It is to be understood that only preferredl embodiments of the invention have been illustrated and described herein, and that modifications and alterations thereof can be made which are within the full intended scope of the invention as dened by the appended claims.

I claim:

l. In control apparatus having rotary controll means, the means for rotating said control means including a movable carriage member having an adjustable element pivotally mounted thereon, an actuator member operatively connected with said carriage member, means supporting said actuator member for non-rotary slidable movement actuator members lying in substantially parallel' planes, said actuator member on sliding movement thereof to one of said operating positions engaging said portion and moving said locking means into frictional engagement with said adjustable element, with sliding movement of said actuator member to the other of said operating positions releasing said adjustable element for free movement to another adjusted position.

2. In control apparatus having rotary control means and frame means therefor, the means for rotating said control means including a movable carriage member having an adjustable element pivotally supported thereon, axis means supDOrting said element, an actuating member support'- ed in said frame means, means operatively connecting said actuating member and adjustable element, but permitting relative movement therebetweenincluding a lever on said carriage member having a portion thereof engageable with said actuating member and another portion erigageable with said element, and axis means substantially at right angles to said carriage member supporting said lever on said carriage member, with said actuating member pivoting said lever about its axis for frictional engagement at said` another portion withv said adjustable element to lock said element in an adjusted position.

3. In control apparatus having movable control means and frame means therefor', the means for moving said control means to a predetermined control position including an operating member movably supported in said frame means, a iiat actuating member having an engaging portion i supported for movement independently of said operating member but being operatively con nected therewith for relative movement in a single plane to at least two operating positions, a locking arm movably supported on said operatlng member and having a portion thereof engageable with said actuating member, means supporting said locking arm on said operating member, a driving member adjustably supported on said operating member and selectively engageable with said movable control means, and axial means supporting said driving member for pivotal movement, said locking arm being positioned substantially entirely between said actuating member engaging portion and said driving member and on movement of said actuating member to one of said operating positions operatively engaging said driving member to frictionally lock the driving member in an adjusted position.

4. In controll apparatus having rotary control direction,

means. the combination of frame means, means for rotating said control means including a mov. able carriage member having an adjustable element pivotally supported thereon, an actuator member slidably supported in said frame means, means connecting said actuating and carriage members but permitting relative movement therebetween, a clamping member movably sup-f rted on said carriage member for movement laterally thereof, said clamping member having a portion frictionally engageable with said adjustable element, an arm pivotally connected at one end to said carriage member, with the other end of said arm being engageable with said actuating member, and axis means pivotally sup- '.porting the arm at said one end and threadably engageable in said carriage member so that said arm is movable laterally of said carriage member into frictional engagement with said clamping member on pivotal movement of said arm in one said actuating member on sliding movement thereof relative to said carriage mein-l ber engaging and pivotally moving said arm in said one direction to frictionally engage said clamping member, which in turn is moved into frictional engagement with. said adjustable member to clamp the same in an adjusted position against said carriage member.

5. In control apparatus having rotary control means, the means for rotating said control means including a movable carriage having an adjustable element pivotally mounted thereon, an Aactuator member operativelyconnected with said carriage member, means for supporting said actuator member for slidable movement relative to the carriage member, a member for releasably clamping said adjustable element in an adjusted position against said carriage member, and a lever having axis means threadably supported in said carriage member so as to be laterally movable of the carriage member on angular-movement thereof, said lever/being operated by said actuating member to frictionally engage said clamping member to move said member laterally into clamping engagement with the adjustable element,

6. Control apparatus having rotary control f on said carriage member and movable to two operating positions by said actuating' member, with said pivotal lever and clamping member having coacting cam portions thereon for laterally moving said clamping member into its clamped en gageme'nt with the adjusting element on angular movement of said lever to one of said operating positions, and with said lever in the other of said operating positionsv having a recessed portion in register with the Acam portion on said clamping member to release said adjustable element from its adjusted position.

'7. In radio tuning means having rotary control means, thecombination of frame means,l means for rotating said control means including porting said element on said operating member,

means operatively connecting said actuating member and said driving element, and axis means supporting said connecting means on said operating member in a position substantially entirely between said driving element and actuating member engaging portion, said connecting means being frictionally engageable with said driving element and having a portion thereof engageable with said actuating member engaging portion,

witlrmovement of said actuating member in a plane parallel to the piane of the operating member operating said connecting means to frictionally lock said driving element in an adjusted position.

8. In control apparatus having movable control means and frame means therefor, the means for moving said control means to a predetermined control position including actuating means and operating means slidably supported on said frame means, means operatively connecting said actuating and operating means for slidable movement together but permitting slidable movement of said actuating means relative to said operating means, an adjustable element on said operating means, axis means substantially at right angles to said operating means supporting said element thereon, said connecting means including a pair of relatively movable portions, second axis means on said operating means substantially parallel to said ,first axis means pivotally supporting said first portion at one end,`with the opposite end of said first portion being operatively engageable with said actuating means, means supporting said second portion for'movement laterally of said operating means and into frictional engagement with saidadjustable element to lock the same in an adjusted position, said first portion on pivotal movement thereof in one direction frictionally engaging( said second portion and laterally moving the same, with said actuating means on sliding movement thereof relative to said operating means pivotally moving said first portion in said one direction to in turn laterally move the second portioninto frictional engagement with said adjustable element, the frictional locking force applied on said ,element being in a direction substantially axially of said two axis means.

9. In control apparatus having control means. the combination of frame means, a selector unit movably mounted on said frame means to move said control means, said selector unit including an actuating member, an operating member, an adjustable element, axis means pivotally supporting said element o n said operating member, with said adjustable element and operating member being arranged in said unit'in substantially parallel planes, and means movably supported on said operating member for movement relative thereto and having a' first portion frictionally engaging said adjustable element to lock said element in an adjusted position, said movable means having a second portion thereof engageable with said actuating member, and said actuating member on non-rotatable movement thereof relative to said operating member engaging said second portion and moving said 75 by spring means to said actuating member at its movable means to effect frictional engagement between said first portion and said adjustable element.

y 10. In control apparatus having movable control means, the combination of frame means, means for moving said control means to a predetermined control position including an operating member* movably supported in vsaid frame means, and a linearly movable actuating member, means for supporting said actuating member for slidable movement relative to said operating member, an adjustable member selectively engageable with said movable control means to move the same to said predetermined control position, axis means pivotally supporting said adjustable member on said operating member, and friction means movably supported on said operating member and movable to frictionally engage and lock said adjustable element in an adjusted position, said friction means `being arranged in a plane substantially parallel to the plane of said operating member and having a portion engageable with said actuating member, said actuating member on sliding movement` thereof in one direction relative to said operating member engaging said portion and moving said friction means into frictional locking engagement with said adjustable element.

11. In 'control apparatus having rotary control means, the means for rotating said control means including a movable operating member having an adjustable element movably mounted thereon, an actuator member operatively connected with said operating member, means supi porting said actuator member for non-rotatable trol means, the means for moving said control l means to a predetermined control position including a linearly movable actuating unit, a relatively at operating unit operatively connected with said actuating unit and having at least a portion thereof in a plane extending in.

the direction of movement of said movlng'means, with said actuating unit being movable with relation to said operating unit and movable 1in- `early but non-rotatably to. at least two operating positions, an ladjustable element supported on said operating unit and operatively connected with said actuating unit, with one of said units having a friction portion operatively engaging said adjustable element and positioned in a plane substantially parallel to said plane of the operating unit, said actuating unit on linear but non- 1 rotatable movement thereof to one of saidoperating positions serving 'to effect a frictional locking of said adjustable element in an adjusted position by means of said friction portion.

13. In radio control means having rotary tuning means, the combination of frame means, a

station selectorv unit movably mounted upon said frame means for movement toward and away from said rotary tuning means, said unit including an actuating member and an operating member, said actuating member being formed with a pair of longitudinally spaced abutments, and said operating member being pivotally connected at one end to said frame means, and.connected opposite end, a driving member pivotally mounted on said operating member, means pivotally connected to said operating member and normally wedged between said operating and driving members to lock the driving member in an adjusted position, said pivotally connected means being engageable with said abutments for movement into and out of such wedgedl position on linear movement of said actuating member.

14.'In control apparatus for a radio receiver having rotary control means, the means for rotating said control means including a movable operating unit having an adjustable member adjustably mounted thereon and movable to a position corresponding to a predetermined tuning frequency for said radio receiver, combination actuating and member locking means, means including said operating unit supporting said combination means with said combination means being movaale with relation to the operating unit, said combination means including a portion having a push button thereon with said push button and said portion being non-rotatably movable in a direction corresponding to the general direc- -tion of movement of said operating unit and including a second portion operatively connected with said first portion and movable into frictional. locking engagement with said adjustable member upon said longitudinal non-rotatable movement of said first portion.

15.*In control apparatus having rotary conrality of parts with one or said parts carrying trol means and frame means therefor, the means for rotating said control means including an operating member movably supported on said frame means, an adjustable element pivotally supported on said operating member, a sliding non-rotatably movable member, means operatively connecting said sliding and operating members but permitting linear movement of said sliding member independently of said operating member,'means intermediate said sliding member and adjustable element having a first portion frictionally engageable ir. an adjusted position, means including said operating member for movably supporting said intermediate means on said operating member, said intermediate means having a second portion operatively engageable with said sliding nonrotatably movable member, with said sliding member on non-rotatable movement thereof in one direction engaging said second portion and moving said first portion into frictional locking engagement with said adjustable element.

16. In radio tuning apparatus having movable control means, a station selector unit for moving said control means including adjustable means, said unit being movable between two stop positions, means for supporting said adjustable means, finger-operated means, means operatively connecting said supporting means and ngel -operated means for relative substantially linear movement, means for applying a frictional holding pressure on said adjustable means to hold the same in an adjusted position, and means movably mounting said holding means on said supporting means vfor engagement by said finger operated means, said finger-operated means cooperatingA with said'holding means in applying said holding pressure to said adjustable means,` said finger-operated means being linearly but non-rotatably puilable in one direction with relation to said supporting means when said unit is in one stop position to change said holding pressure for application to said adjustable means, and said nger-operated means being with said element to lock said element linearly for application lto said adjustable means.

17. Control apparatus includingfin combination a control unit movable over a patiti; means for stopping the control unit at one `end of the path, and second means for stopping :said: control unit. at the other end of the path, said'control lunit including a carriage portion, another portion operatively connected with said carriage portion and adapted to be selectively pushed or pulled longitudinally but non-rotatably relative thereto when the unit is stopped at one end orlthe other of its path,v adjustable means on said unit, and locking means supported on one of said portions, operatively connected with the other portion and with said adjustable means,

` said locking means being movable upon said longitudinal but lnon-rotatable movement of said another portion to a position to releasably lock or unlock said adjustable means depending upon whether said another portion is pushed or pulled.

18. In a tuning structure for a radio set, a push-button slidable structure including a pluan adjustable setting device, means including at least another part of the slidable structure for holding said setting device in an adjusted position and including a portion thereof adapted to be pulled toward the operator in a non-rotatable movement for acting at least on said another part of said means to release the setting device preparatory to a new adjustment thereof.

19. In a tuning structure for a radio set having positioning means for actuating tuning means, a selector-slide-structure carrying an adjustable setting device for operating said positioning means. a clamping device for holding said setting device in an adjusted position, a manually pullpush operable means forming a part of said slidestructure for operating said clamping device so as to release or clamp said setting device.

moving means, and means holding said adjustable means in an adjusted position including af member lying in a. single plane extending longitudinally of the general line of movement of the moving means and pivotally movable over an arc in auch plane to hold or release said adjustable means on said operating member.

21. In a radio tuning apparatus having positioning means, means for moving said positioning means including an operating portion having adjustable means thereon for moving the positioning means to a predetermined position, holding means acting on said adjustable means, and a member lying in a single plane extending longitudinally of the general line of movement of the moving means and pivotally movable over an arc` in such plane and acting on said .holding means to hold said adjustable means in an adjusted position or release said adjustable means therefrom.

22. In control apparatus having movable control means, the means for rotating said control means including a movable operating member having an adjustable element movably mounted thereon, an actuator member operatively connected with said operating member and supported for lnon-rotatable movement in a direction correspondingto the general direction of movement of the operating member, means-operated bythe actuating member and movable in a plane vs ubstantially parallel to thel plane of the adjustable element for holding the adjustable element in an adjusted position or releasing-it therefrom, and manual means on the actuator member for pullable-pushable movement thereof relative to said adjustable element to effect said holding or l release thereof. l

23. In control mechanism having controllable means, a selector-siide-structure including adjustable setting means carried thereonfor operating the controllable means, a'manually pull- ,able-pushable portion comprising a part of said selector-slide-structure pullably and pushably, movable in a direction substantially away from or toward said adjustable setting means, and also including a second portion comprising a part oi said structure movable upon said movement of said first mentioned portion to hold or release l0 said adjustable setting means.

All/EXANDER W. PLENSLER. 

